Notes on the Insecta in the Collection of the Cesa Lepidoptera of Turkey-I. Cesa News 66: 1-37. The present paper deals with some results on the faunistical activities of the Cesa. The authors list some of the lepidopteran specimens from 22 provinces of Turkey of the Cesa Collection, comprising various insect groups from Turkey, as well as from abroad, Balkans, East and South Africa, Middle East, Central Asia, and South East Asia, incl. The Philippines. The present list contains the selected specimens of the following 15 families of the butterflies and moths, collected or observed between 1998 and 2009 from various provinces of Turkey: Adelidae, Arctiidae, Argynnidae, Brahmaeidae, Cimeliidae, Cossidae, Coleophoridae, Ctenuchidae, Drepanidae, Ethmiidae, Geometridae, Hesperiidae, Lasiocampidae, Libytheidae, and Lycaenidae. The collecting information is composed of the number of the collected specimens, code of Turkish provinces, name of districts, localities with altitudes, date of collecting, names of the collectors or observers, and short notes of the collecting, the habitat or feeding biology of the specimens.